build menu with mysql data

Hi, I would like to bild a tree menu with mySQL data. where I have the collapsed main menue and when I click the link the specific submenue expands (as follow). (collapsed Main Menu) + Home + Downloads + About me + Search ....and for example if I click the "Download" section it will look as follow.... (expanded Main-Sub Menu) + Home + Downloads - Music - Programm + About me + Search ....and the SQL Tables... MAINMENUE_TABLE ID NAME ----------------------------- | 1 | Home | | 2 | Downloads | | 3 | About me | | 4 | Search | ....and.... SUBMENUE_TABLE ID MAIN_ID NAME URL ------------------------------------------------------------------- | 1 | 2 | Music | ./somefile.php?action=music | 2 | 2 | Programm | ./somefile.php?action=programm | 3 | 3 | Pictures | ./somefile.php?action=pictures | 4 | 3 | Address | ./somefile.php?action=address | 5 | 4 | My Page | ./somefile.php?action=mypage | 6 | 4 | The Web | ./somefile.php?action=theweb | 7 | 4 | Google | ./somefile.php?action=google If I'm using a while loop it won't work, so I realy don't have and more ideas... Please consider in your explanations I'm a PHP beginner... :-) thanks Marc